Lifting jack and hauler



Apnf. 17, 1923.

c E. cLEws ET AL LIFTING JACK AND HAULER Filed June e, 1922 HILLPatented Apr. 17, 1923,

Aum'rEo srarEs :Param orales.

` CHAELES EDMUND cLEws AND ARTHUR WYNDHAM EEEEE, E AUCKLAND, NEW

ZEALAND, AssIGNoEs To PEECY NicHoL KINeswELL, or AUCKLAND, NEWy ZEALAND.

' LIETING JACK .AND HAUEEE.

Application filed 2l une 6,

To all 'whom t may concern.'

Be itA lmown that we, CHARLES EDMUND CLEws and ARTHUR WYNDHAM BEERE,both` citizens of the Dominion of New Zealand and subjects of the Kingof Great-Britain, and residing at Prospect Terrace,jPaeroa, Auckland,and rProspect Place, Auckland, respectively, both in theProvincialDistrict yof Auckland, have invented certain new and l0.useful Improvements in Lifting Jacks and Haulers, of which the followingisa specification. o

This inventionrelates to jacks for lifting i improvements, whereby thejack constructf ed and oper-ated as described in the aforesaidspecification will be rendered more positive in its actionthanheretofore, besides which the operation of the jack will befacilitated and the latter given longer life.l

The main feature of the invention is the fprovision of means forensuring the engagement and retention in the rack or spear or the chain,in a positive and certain man-I `ner whenever required of thek pawlemployed for holding the load. while the grip, of said rack or spear orthe chain, by the pawl on the operating leveris being changed.

l This-is enabled to be done by constructing and mounting the operatinglever of the jack, so that its, inner end, when moved f downwards willbearjagainst and force the load holding kpawl intok engagement-with therack or spear or the chain, such enson gagement being ensured andcontinued ydur-f ing the time that the pawl on the operating lever isdisengaged from the rack or spear or the chain.

AQ .further feature of the` invention is the provision on the inside ofthe casing at the side against which the rack or'spearA yor the-chain isforced by the actionof the ,pawlsof.af Vertical rib or stripat each sideofwhich thelinks of the chain, when the latter is employed. pass, therollers of the chain bearing' yagainst the rib or strip ys las tofacilitate movementof `the lchain through theA casing; and. givingklonger. llfe 1922. semi No. 566,291.

to the latter and the-chain than where the lmljzs are forced hard intocontact with the casing side. Owing to the insertion of the rib or stripin the casing, it becomes necessary to groove or recess the rack orspear, in orderk thatsamecan be used in place of the chain.

Referring to the accompanying drawing in conjunction with which'theinvention will be more particularly described `Figure 5 is a similarview of Figure 4, but

showing a chain in the jack. y

In the drawing 1 is the casing, 2 therack or spear.y3 vthe chain and 4the guide between whichand the casing side the rack or spear 2, or thechain 3 works. 5 is the operating; leverfulcrumed at 6 to the casing,and 7 is the pawl carried by said lever. 8 is the pawl used for holding'the load during the time the' grip.' of the rack or spear 2 or the chain3 by the pawl 7 is being changed. k9 is the yrocking arm carrying.springs y10, 11, 12, and mountedv and adapted to be operated forl thepurpose set forth as describedk in the before mentioned specification. y

rl`he inner orfforked end 5a of the operating lever 5 inwhich the pawl 7is pivoted is bevelled and hask its lower corners rounded as shown sothat on downward movement of said forkedend 5a occurring the lattermakes contact with and fits against ran inclined surface 17 on the backof the upper end ofthe pawlS. f y l The opening` 18 at the top` of thecasing `through which the rack orspear 2, or the ychain 3 passes has atone side an under cut or*z inclined surface19, between which and vtheupperk portion of the pawl 7 an upwardly curved spring 20, secured tothe inside of the upper endv'of the casing 1 projects. j `0n the innerside of the side lof the casing 1. a vertical rib or strip 21-isprovidedywhile at the top of said sidey 1a a roll or outwardly anddownwardly bent por- .,tion 22 is formed, over which the chain (whenused) hangs as shown; i y

Figure lis a sectional elevation of the the side l, by the action of thepawls 7, 8.

The raclror spear is grooved as at 24, to enable it tok accommodate therib or strip 21, thereby enabling either'the rack or spear, or lthechain to be employed as desired.

To use the jack forlifting or hauling pun poses the handle 16 isoperated to' lcause the Vsprings lO and 1l` to press against the. tailends of the pawls 8 and 7 as shown in Figure l so thatthe upper ends 8a"and 7a of v" rsaid pawls normally engage in theteeth 2a,

or in the chain, according to which is em- The outer endof the operatinglever is then worked upwards and downwards and on downward movement ofthe pawl 7 taking place, the upper end 7 a of the latter slips down overthe teeth a or over the roller l` 3a of rthe chain 3 the upper end 8a ofthe pawl 8 being in ythe meantime forced by the 'spring lOand inner end5' of the lever 5 into the teeth 2a orinto the chain 3 to hold ytherack, spear, or the cliainagainst down-I ward movement until such tiineas the up- 'pe'r end 7a of the' pawl 7 is again inserted in the teeth 2aor grips the cha-in 3, on the outer end of rthe operating lever 5 beingdepressed to force the rack or spear 2 or the chain 3 through the casingl.

*tion shown in Figure 2, with the springs 11,

l2 pressing against the tails of the pawls 8 and 7 respectively, so thatnormally the upperend 8fL and 7a of said pawls will be kept fromengaging, or will be clear of the rack or spear 2, ortho chain 3.

@The operating lever 5 is then worked up'- wards and downwards asbefore, upward,- movement of the pawl t portion to make contact with thespring 20,

4whereb)7 the end 7a 0f Said Paw1 ls forced to engage inthe teeth 2@L ofthe rack or spear 2, i or to Agrip a roller 3a of the chain 3 as the f.case may 'be and to raise said rack or spear,

Ar end 8a or the chain suiliciently to enable the upper free itselfvfrom said rack or spear 2 or the chain 3, under the influence of thespring ll.

lthe rack or spear 2 in the casing l.

as the ma sa ail-fred @sa 5a er steeper? causing its upperk of the pawl8 to spring out of or towbeing lowered.

, or the 'chain 3 tode'scend ating lever 5 descends, it makes `contactwith the surface 17 on the back ofl the pavvl 8, and forces the upperend PrL of the latter into the teeth 2a ot therack or spear 2 or so asto grip a roller 3f* of the chain 3. The pawl 8 now takes the weight or"the loadand` the Continued downward movement of the end 5'rl ot thelever 5, results in thepawl 7 'being lowered, until its upper end 7L isenabled to spring out of and clear the teeth 2a, or the chain 3 yas thecaseniay be, the yend 5LL meanwhile'bearing against andretaining theupper end Sa of thefpawl 8 in engagement 'with the' teeth 2l'ofthe "rackor spear or in the chain 3Q Follow'ingthis' lthe iniieneiid 5,of thelever 5 is Vraised again to enable the'pawl 7 to obtain a` fresh gripfoftherack or spear. or or' the chain, tlietresh gripby the pawl 7 beingobtained before `the lend 5 of 'the 'l'ever` clears the back ol" thepawl S'suiliciently, to enable the latter to springorfcoine out ofengagement withfthe'i rack or spear, or the -chain,`"should""by anycl'i'ancethe weight of ythe load bev eren momentarily taken off 'saidpaw/l 8. y,

llhile the weight of; 'the load isfbeing borne by the pawl 8, the loadissa'felyyh'eld,

,as owing to the end 51 of the lever be-` ing againstfthe lever 8,' thelatter must remain in'the 'teeth 2a or inv the",y y(':l'iain 3 against`the `action of vthe spring 11'e'ven should the rack or [spear ortheVchainbe relieved of downward pressure. l

If thelever 5v be yaccide'ntallyl moi/'ed to thel position where fits"end 5a clearsthe lever 8, the load y"cannotrim-'pany' appreciable"extent, because inV Athis posit-ionI the pawl 7 is" engaged iny'the'teeth 2a' orfin the In order to enable a load to be loweredHy*"gradualljg th'ereversing handle 16, is oper! ated tobring the rockingarm` 9 to the posichaini,r4 and the slightest downward movefinentr ofsaid lever 7 ,"has 'the effect of irnvthrough a casing; a pawl pivotedto the latteradapted to hold'said member against theweight: ot'the loadI`borne thereby; an .operating lever pivoted to said casing carrying atone' end a pawlada-pted 'to engage and operate said nieniberg'saidleverhaving its pawl carrying end formed yto Iforce the load holdingpawl into engagement with the load bearing ineinber. on said inner end I2. Apparatus the kind described, ic'omy"p'rising a? casing vwith aninternal 'rib' or strip on *onev side; a load 'bearing `member with sideportions which pass at veach side Vof .said `libf ory Operable through.Said Carnes a, paw/11 with an maimed upper-Sup ifaicehpwd to the lm-375adapted" to' hold said member against the Weight of the `load bornethereby; an operating lever pivoted to said casing and having a bevelledand forked inner end in which a load shifting pawl is pivoted; saidinner end being positioned so that on being lowered it engages the backof the load holding pawl and forces same into engagement with the loadCarrying member.

3. In apparatus of the kind described, wherein a load shifting paWl anda load holding paWl are employed; an operating lever carrying the loadshifting paWl, and having` its inner end formed to force the loadholding paivl into-engagement With` the load bearing member, on saidinner end being lowered. l

ll. In apparatus of the kind described wherein a load shifting paivl andla load holding paWl are employed, an operating lever with a forkedinner end in which the load shifting lever is pivoted, the ends of saidfork being bevelled and provided with rounded lower corners; an inclinedsurface on the back of the upper portion of the load holding paWl,against Which.` the forked end of the operating lever makes Contact,l

and forces said paivl into engagement with against said casing side, andprovided With' side portions which pass at each side of the rib orstrip.

6. In apparatus of the kind described an internal rib or stripI at oneside of the easing and a roller chain Working through the easing againstsaid side, so that the rollers run against said rib or strip and thelinks pass at eaoh side thereof.

In testimony whereof We have signed our names to this specification inthe presence of two witnesses. l s

CHARLES EDMUND CDEVVS.

ARTHUR WYNDHAM BEERE. Witnesses IVILLIAM PoRloHns,

DOUGLAS ERROE GRAY.

